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WO2010095947A1 - Procédé et dispositif de régulation de pression d'un puits - Google Patents

Procédé et dispositif de régulation de pression d'un puits Download PDF

Info

Publication number
WO2010095947A1
WO2010095947A1 PCT/NO2010/000050 NO2010000050W WO2010095947A1 WO 2010095947 A1 WO2010095947 A1 WO 2010095947A1 NO 2010000050 W NO2010000050 W NO 2010000050W WO 2010095947 A1 WO2010095947 A1 WO 2010095947A1
Authority
WO
WIPO (PCT)
Prior art keywords
drilling
fluid
pressure
return path
well
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/NO2010/000050
Other languages
English (en)
Inventor
Roger Sverre Stave
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGR Subsea AS
Original Assignee
AGR Subsea AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AGR Subsea AS filed Critical AGR Subsea AS
Priority to US13/201,554 priority Critical patent/US20110297388A1/en
Priority to BRPI1008074A priority patent/BRPI1008074A2/pt
Publication of WO2010095947A1 publication Critical patent/WO2010095947A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure

Definitions

  • This invention relates to a method for the pressure regulation of a well. More particularly, it relates to a method for the pressure regulation of a well extending into a well for- mation and being drilled from a vessel at sea, the well including a blowout preventer on the seabed and a riser extending from the blowout preventer up to the vessel, and the return path of the drilling fluid being provided with a rotating surface seal sealingly surrounding a drill string, the rotating surface seal being arranged to seal against a pressure difference between the surroundings and the return path, and there being arranged a closable drilling- fluid outlet at the rotating surface seal.
  • the invention also includes a device for practising the method.
  • the specific weight of the drilling fluid is adjusted to be such that the pressure head of the drilling- fluid column resists the pore pressure, preventing well fluid from entering the borehole during drilling.
  • drilling fluid must also be able to fill other functions. For example, it must be relatively viscous to carry cuttings up to the surface.
  • the drilling-fluid pressure in the formation is made up of, inter alia, the static pressure from the fluid column and a dynamic pressure, the so-called frictional pressure, from the flowing drilling fluid.
  • the static pressure from the drilling fluid must, as mentioned above, be sufficiently large to prevent inflow of well fluid from the well formation, but not so large that it exceeds the fracture pressure so that drilling fluid will flow into the well formation.
  • the frictional pressure may, when there is little difference between the pore pressure and the fracture pressure, make the fracture pressure be exceeded. Drilling fluid may then flow into the formation. Apart from the loss of relatively expensive drilling fluid, such outflow, often termed “lost circulation” , may also entail damage to the formation, for example cause reduced production later on, and also considerable time lost in connection with the drilling operation.
  • NO patent 319213 discloses a method in which the return path is filled with a fluid which has a lower specific weight than the drilling fluid.
  • the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art .
  • the method is characterised by including:
  • drilling can be carried out in a manner known per se, by the closable drilling-fluid outlet being opened. Drilling fluid thereby flows back via the return path, which is formed, in this preferred embodiment, by inter alia an an- nulus between the riser and the drill string. Since chokes are unnecessary in the return path, the return drilling fluid may flow freely in the return path.
  • the closable drilling- fluid outlet may be closed in order thereby to be able to establish an overpressure or underpressure in the return pipe relative to the surroundings.
  • the static pressure in the well formation can be reduced immediately, for example by the drilling- fluid level being lowered in the return path, whereby an underpressure is established in the upper portion of the return path.
  • Cuttings and drilling fluid may thus be circulated out of the well, also when the fluid column in the return path is at a lower height level, so that drilling fluid can no longer flow out via the closable drilling-fluid outlet.
  • At least a portion of the return path that is above the pump inlet may be filled with a second fluid of a different specific weight, normally lower, in relation to the drilling fluid.
  • the static pressure from the fluid column may thereby be adjusted to wells in which both the formation pressure and the fracture pressure are relatively low.
  • the pumping rate may be controlled also to keep the interface between the drilling fluid and the second fluid at an approximately constant height level .
  • the method may be practised by means of a pressure-regulation device for a well extending into a well formation and being drilled from a vessel at sea, the well including a blowout preventer on the seabed and a riser extending from the blow- out preventer up to the vessel, and the drilling- fluid return path being provided with a rotating surface seal surrounding a drill string, the rotating surface seal being arranged to seal against a pressure difference between the surroundings and the return path, and there being arranged a closable drilling- fluid outlet at the rotating surface seal, and the pressure-regulation device being characterized by a pump inlet from the return path being arranged under water and a pump being connected to the return path, the pump being connected to a pipe which discharges on the vessel, the pumping rate being adjustable to maintain a substantially constant drilling-fluid pressure in the well formation, both when drilling fluid is flowing and when it has
  • At least a portion of the return path that is above the pump inlet may be filled with a second fluid which has a different specific weight in relation to the drilling fluid.
  • a physical partition for example in the form of a piston- like component, may be arranged between the drilling fluid and the second fluid.
  • the device When the closable drilling-fluid outlet is open, the device corresponds to what is described in NO 319213.
  • the pumping rate may be controllable to be able to keep an interface between the drilling fluid and the second fluid at an approximately constant height level .
  • Known methods that include a rotatable surface seal are formed to utilise a static pressure from the drilling fluid at the formation, the static pressure being selected to be suitable when there is circulation of drilling fluid.
  • the fluid column is subjected to extra pressure to prevent inflow of well fluid when the drilling-fluid circulation is stopped. This makes it difficult to open the system to replace a rotating seal and so on.
  • the static pressure may be adjusted to the formation pressure of the well formation when there is no circulation of drilling fluid, and this static pressure may be reduced by means of the pump to avoid exceeding the fracture pressure as circulation is started.
  • the system may then freely be opened as the drilling fluid itself maintains a sufficient static pressure in the formation, as in conventional drilling.
  • the method and the device according to the invention also render a rotating seal in the riser or at the seabed superfluous. Such seals must be pulled out every time the drill pipe is to be pulled out, which is both complicated and time- consuming.
  • Figure 1 shows schematically a section of a well in accordance with the invention.
  • Figure 2 shows schematically a section of a well in accor- dance with the invention in an alternative embodiment .
  • the reference numeral 1 indicates a well which extends down into a well formation 2 and in which a drill string 4, which is provided with a drill bit 6, extends from a vessel not shown into the well formation 2.
  • a casing 8 is connected to a blowout preventer 10 on the seabed 12.
  • a riser 14 enclosing the drill string 4 extends from the vessel, not shown, down through the sea surface 16 to the blowout preventer 10.
  • the riser 14 is suspended from the vessel not shown by means of a riser tensioner 18, the telescopic pipe 20 of the riser 14 being provided with a rotatable surface seal 22.
  • the rotatable surface seal 22 is arranged to seal against the drill string 4 also when the drill string 4 is rotating.
  • the casing 8, riser 14 and telescopic pipe 20 form a return path for a drilling fluid 24.
  • the telescopic pipe 20 is provided with a drilling-fluid outlet 28 closable by means of a valve 26.
  • a pump 30 is connected to a pump inlet 32 on the riser 14 and to a pressure pipe 34 extending to the vessel not shown.
  • a pressure gauge 36 communicates with the riser 14 at the pump inlet 32.
  • drilling fluid may return via the return path 8, 14, 20 and flow out via the closable drilling- fluid outlet 28. If measurements should show that drilling fluid 24 is entering the well formation 2, the pump 30 may be started while, at the same time, the closable drilling-fluid outlet 28 is closed by means of the valve 26.
  • the static pressure from the drilling-fluid column is reduced by reducing the drilling- fluid column height, whereby the fracture pressure is no longer exceeded.
  • the static pressure is increased by stopping or reducing the flow rate through the pump 30 to prevent the entrance of well fluid from the well formation 2.
  • the height position of the pump inlet 32 is determined from the prevailing pressure conditions in the well formation 2, the maximum pressure reduction achievable being the pressure head of the of the drilling-fluid column between the ro- tatable surface seal 22 and the pump inlet 32.
  • a second fluid 38 which has a different specific weight in relation to the drilling fluid 24.
  • An interface 40 is established between the drilling fluid 24 and the second fluid 38, see figure 2.
  • valve 2 ⁇ If the valve 2 ⁇ is open, the device functions in a manner corresponding to the method according to NO 319213 in which the advantages of a so-called dual-gradient system is described.
  • the method according to NO 319213 does not include a rotatable surface seal 22.
  • this alternative method makes it possible for a relatively rapid change of the static pressure in the drilling fluid to take place.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention concerne un procédé de régulation de pression d'un puits (1) qui s'étend à l'intérieur d'une formation de puits (2) et est foré depuis un navire de forage en mer, le puits (1) comprenant un obturateur anti-éruption (10) disposé sur le fond marin (12) et une colonne montante (14) prolongeant l'obturateur anti-éruption (10) jusqu'au navire, le circuit de retour (8, 14, 20) d'un fluide de forage (24) étant muni d'un joint tournant de surface (22) entourant de façon étanche un train de tiges de forage (4), le joint tournant de surface (22) étant agencé de façon à assurer une étanchéité contre une différence de pression entre le milieu environnant et le circuit de retour (8, 14, 20), une sortie de fluide de forage (28) apte à être fermée étant aménagée au niveau du joint tournant de surface (22). Le procédé comporte les étapes consistant à : - aménager une entrée de pompe (32) partant du circuit de retour (8, 14, 20) ménagé sous l'eau; - raccorder une pompe (30) au circuit de retour (8, 14, 20), la pompe (30) étant raccordée à une conduite de pression (34) dont le refoulement se situe sur le navire; - surveiller la pression de fluide de forage; et – réguler le débit de pompage traversant la pompe (30) de façon à maintenir une pression de fluide de forage sensiblement constante au niveau de la formation de puits (2), aussi bien lorsque le fluide de forage (24) circule que lorsqu'il est arrêté.
PCT/NO2010/000050 2009-02-18 2010-02-11 Procédé et dispositif de régulation de pression d'un puits Ceased WO2010095947A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US13/201,554 US20110297388A1 (en) 2009-02-18 2010-02-11 Method and device for pressure regulation of a well
BRPI1008074A BRPI1008074A2 (pt) 2009-02-18 2010-02-11 método e dispositivo para regulagem de pressão de um poço

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20090767 2009-02-18
NO20090767A NO329687B1 (no) 2009-02-18 2009-02-18 Fremgangsmate og anordning for a trykkregulere en bronn

Publications (1)

Publication Number Publication Date
WO2010095947A1 true WO2010095947A1 (fr) 2010-08-26

Family

ID=42634067

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2010/000050 Ceased WO2010095947A1 (fr) 2009-02-18 2010-02-11 Procédé et dispositif de régulation de pression d'un puits

Country Status (4)

Country Link
US (1) US20110297388A1 (fr)
BR (1) BRPI1008074A2 (fr)
NO (1) NO329687B1 (fr)
WO (1) WO2010095947A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8201628B2 (en) 2010-04-27 2012-06-19 Halliburton Energy Services, Inc. Wellbore pressure control with segregated fluid columns
US8281875B2 (en) 2008-12-19 2012-10-09 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US8776894B2 (en) 2006-11-07 2014-07-15 Halliburton Energy Services, Inc. Offshore universal riser system
US8820405B2 (en) 2010-04-27 2014-09-02 Halliburton Energy Services, Inc. Segregating flowable materials in a well
US8833488B2 (en) 2011-04-08 2014-09-16 Halliburton Energy Services, Inc. Automatic standpipe pressure control in drilling
US9080407B2 (en) 2011-05-09 2015-07-14 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US9169700B2 (en) 2010-02-25 2015-10-27 Halliburton Energy Services, Inc. Pressure control device with remote orientation relative to a rig
US9567843B2 (en) 2009-07-30 2017-02-14 Halliburton Energy Services, Inc. Well drilling methods with event detection
US9605507B2 (en) 2011-09-08 2017-03-28 Halliburton Energy Services, Inc. High temperature drilling with lower temperature rated tools
US9823373B2 (en) 2012-11-08 2017-11-21 Halliburton Energy Services, Inc. Acoustic telemetry with distributed acoustic sensing system
US10724315B2 (en) 2015-02-25 2020-07-28 Managed Pressure Operations Pte. Ltd. Modified pumped riser solution

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8783358B2 (en) * 2011-09-16 2014-07-22 Chevron U.S.A. Inc. Methods and systems for circulating fluid within the annulus of a flexible pipe riser
WO2014062664A2 (fr) * 2012-10-15 2014-04-24 National Oilwell Varco, L.P. Système de forage à deux gradients
US9194225B2 (en) * 2012-11-07 2015-11-24 Chevron U.S.A. Inc. Systems and methods for sensing a fluid level within a pipe
NO338020B1 (no) * 2013-09-10 2016-07-18 Mhwirth As Et dypvanns borestigerørstrykkavlastningssystem omfattende en trykkfrigjøringsanordning, samt bruk av trykkfrigjøringsanordningen.
US9500035B2 (en) 2014-10-06 2016-11-22 Chevron U.S.A. Inc. Integrated managed pressure drilling transient hydraulic model simulator architecture
US10538986B2 (en) * 2017-01-16 2020-01-21 Ensco International Incorporated Subsea pressure reduction manifold
US10988997B2 (en) * 2018-01-22 2021-04-27 Safekick Americas Llc Method and system for safe pressurized mud cap drilling

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000039431A1 (fr) * 1998-12-29 2000-07-06 Elf Exploration Production Procede et dispositif pour regler a une valeur de consigne le niveau du fluide de forage dans le tube prolongateur
US6263982B1 (en) * 1998-03-02 2001-07-24 Weatherford Holding U.S., Inc. Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling
US6668943B1 (en) * 1999-06-03 2003-12-30 Exxonmobil Upstream Research Company Method and apparatus for controlling pressure and detecting well control problems during drilling of an offshore well using a gas-lifted riser
US20040065440A1 (en) * 2002-10-04 2004-04-08 Halliburton Energy Services, Inc. Dual-gradient drilling using nitrogen injection
US20040238177A1 (en) * 2001-09-10 2004-12-02 Borre Fossli Arrangement and method for regulating bottom hole pressures when drilling deepwater offshore wells
US20080105434A1 (en) * 2006-11-07 2008-05-08 Halliburton Energy Services, Inc. Offshore Universal Riser System
WO2009123476A1 (fr) * 2008-04-04 2009-10-08 Ocean Riser Systems As Systèmes et procédés pour forage sous-marin

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US4063602A (en) * 1975-08-13 1977-12-20 Exxon Production Research Company Drilling fluid diverter system
US6457529B2 (en) * 2000-02-17 2002-10-01 Abb Vetco Gray Inc. Apparatus and method for returning drilling fluid from a subsea wellbore
WO2008151128A2 (fr) * 2007-06-01 2008-12-11 Horton Technologies, Llc Système de renvoi de boue de densité double

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6263982B1 (en) * 1998-03-02 2001-07-24 Weatherford Holding U.S., Inc. Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling
WO2000039431A1 (fr) * 1998-12-29 2000-07-06 Elf Exploration Production Procede et dispositif pour regler a une valeur de consigne le niveau du fluide de forage dans le tube prolongateur
US6668943B1 (en) * 1999-06-03 2003-12-30 Exxonmobil Upstream Research Company Method and apparatus for controlling pressure and detecting well control problems during drilling of an offshore well using a gas-lifted riser
US20040238177A1 (en) * 2001-09-10 2004-12-02 Borre Fossli Arrangement and method for regulating bottom hole pressures when drilling deepwater offshore wells
US20040065440A1 (en) * 2002-10-04 2004-04-08 Halliburton Energy Services, Inc. Dual-gradient drilling using nitrogen injection
US20080105434A1 (en) * 2006-11-07 2008-05-08 Halliburton Energy Services, Inc. Offshore Universal Riser System
WO2009123476A1 (fr) * 2008-04-04 2009-10-08 Ocean Riser Systems As Systèmes et procédés pour forage sous-marin

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9051790B2 (en) 2006-11-07 2015-06-09 Halliburton Energy Services, Inc. Offshore drilling method
US9127512B2 (en) 2006-11-07 2015-09-08 Halliburton Energy Services, Inc. Offshore drilling method
US8776894B2 (en) 2006-11-07 2014-07-15 Halliburton Energy Services, Inc. Offshore universal riser system
US9085940B2 (en) 2006-11-07 2015-07-21 Halliburton Energy Services, Inc. Offshore universal riser system
US9376870B2 (en) 2006-11-07 2016-06-28 Halliburton Energy Services, Inc. Offshore universal riser system
US8887814B2 (en) 2006-11-07 2014-11-18 Halliburton Energy Services, Inc. Offshore universal riser system
US9157285B2 (en) 2006-11-07 2015-10-13 Halliburton Energy Services, Inc. Offshore drilling method
US8881831B2 (en) 2006-11-07 2014-11-11 Halliburton Energy Services, Inc. Offshore universal riser system
US9127511B2 (en) 2006-11-07 2015-09-08 Halliburton Energy Services, Inc. Offshore universal riser system
US8281875B2 (en) 2008-12-19 2012-10-09 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US9567843B2 (en) 2009-07-30 2017-02-14 Halliburton Energy Services, Inc. Well drilling methods with event detection
US8286730B2 (en) 2009-12-15 2012-10-16 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US8397836B2 (en) 2009-12-15 2013-03-19 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US9169700B2 (en) 2010-02-25 2015-10-27 Halliburton Energy Services, Inc. Pressure control device with remote orientation relative to a rig
US8261826B2 (en) 2010-04-27 2012-09-11 Halliburton Energy Services, Inc. Wellbore pressure control with segregated fluid columns
US8201628B2 (en) 2010-04-27 2012-06-19 Halliburton Energy Services, Inc. Wellbore pressure control with segregated fluid columns
US8820405B2 (en) 2010-04-27 2014-09-02 Halliburton Energy Services, Inc. Segregating flowable materials in a well
US8833488B2 (en) 2011-04-08 2014-09-16 Halliburton Energy Services, Inc. Automatic standpipe pressure control in drilling
US9080407B2 (en) 2011-05-09 2015-07-14 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US9605507B2 (en) 2011-09-08 2017-03-28 Halliburton Energy Services, Inc. High temperature drilling with lower temperature rated tools
US10233708B2 (en) 2012-04-10 2019-03-19 Halliburton Energy Services, Inc. Pressure and flow control in drilling operations
US9823373B2 (en) 2012-11-08 2017-11-21 Halliburton Energy Services, Inc. Acoustic telemetry with distributed acoustic sensing system
US10724315B2 (en) 2015-02-25 2020-07-28 Managed Pressure Operations Pte. Ltd. Modified pumped riser solution

Also Published As

Publication number Publication date
US20110297388A1 (en) 2011-12-08
NO329687B1 (no) 2010-11-29
NO20090767L (no) 2010-08-19
BRPI1008074A2 (pt) 2016-03-15

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